Roford 310 Cynomys ludovicianus October 29, 1955 Nr. Ft. Collins, Colo. fold pond. This one went down at gradual slope in straight line so about 3' underground 6' from entrance. Soft wet clay at surface, but hard dry clay 2' down. Digging very difficult. One group of students mapped burrows on a 5A plot to S. of fence on Bda slope. Others measur- ed amount of soil in mounds by filling box of known volume. Another measured slope of burrows farther up the limestone ridge at E. side colony. Artist named Dolor M. Wineland counted 17 (6+4 jivs) + perhaps 22 on this colony, S. of E-W fence, in early April 1952 Kelly (field report submitted for course). R. G. Hay & D.C. Kelly, in May, 1954, watched for 12 hours & saw minimum of 16 prairie dogs. Their plot of burrows (215 judged currently used) shows greatest density in bottom at N. end (only part 5 of fence surveyed). All called microtis. All in area of (about 26A (my calculation)), slightly over 11 burrow/A. October 29, 1955 Boston, Mass. At Amer. Ornith. Union meetings - talked with Victor Cakaline, formerly chief biologist of National Park Service now at New York State Museum, Albany. He knew little of the poisoning in Wind Cave National Park. However, he had worked there as a ranger about 20 years ago. He said that in middle 1930's the park prairie dogs were poor because of long overgrazing. He also told me that the Norfolk Dam tower extended E. of the highway even 20 years ago. He took no note on prairie dog status at Wind Cave, but even.